In 1666, Sir Isaac Newton conducted a famous experiment that has been widely considered as a landmark discovery in the study of optics and color theory. Inspired by this discovery, PRISMA1666 is a light interactive installation consists of 15 triangular crystal blocks distributed randomly on a clean white surface. Projection of colorful graphics is refracted and dispersed by these crystal blocks, creating a fascinating visual experience and performance. Special thanks to our project collaborator - Wonwei.